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浙江大学学报(工学版)
JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
Earth Sciences and Enginnering     
Experimental study on feasibility of fiber Bragg grating-based foundation deformation monitoring
LI Fei, ZHU Hong hu, ZHANG Cheng cheng, SHI Bin
1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
2. Nanjing University HighTech Institute at Suzhou, Suzhou 215123, China
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Abstract  

A new method was proposed to measure strain distributions and understand deformation of ground soil using fiber Bragg grating (FBG) technique in order to solve the problems of low monitoring efficiency, large error and low accuracy in traditional ground deformation monitoring. A plane-strain model test of loaded sand foundation instrumented with embedded FBG sensors was conducted. The particle image velocimetry (PIV) technique was used to obtain the strain distribution of the model foundation behind the sidewall of the test chamber. The test results show that the FBG sensors can capture the accumulation of internal strains within the soil mass with high sensitiveness under different loading levels. The characteristics of the measured strain distribution agreed well with the PIV results, truly reflecting the deformation of failure patterns of the model foundation. The feasibility of applying FBG fiber optic monitoring technique to foundation deformation monitoring was preliminarily verified. Results indicate that PIV can be used as an auxiliary tool to validate or calibrate the FBG strain measurements. The discrepancy between the strain readings measured by these two methods is due to several factors, such as experimental errors, deformation compatibility of the sensors and photographic quality.

Published: 01 January 2017
CLC:  TU 433  
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LI Fei, ZHU Hong hu, ZHANG Cheng cheng, SHI Bin. Experimental study on feasibility of fiber Bragg grating-based foundation deformation monitoring. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2017, 51(1): 204-211.


地基变形光纤光栅监测可行性的试验研究

针对传统地基变形监测存在的监测效率低、误差大、精度低等问题,提出通过光纤光栅（FBG）技术监测地基应变分布、掌握地基变形规律的新方法.开展基于埋入式FBG应变传感器的平面应变砂土地基加载模型试验,利用粒子图像测速（PIV）技术获取模型箱侧壁地基土体的应变分布规律.监测结果表明,采用FBG技术能够灵敏地捕捉到土体在逐级荷载下的内部应变累积过程,获得的应变分布特征与PIV结果较吻合,真实反映了模型地基的变形和破坏模式,初步证明了FBG光纤监测技术应用于地基变形监测的可行性.该研究说明,PIV技术可以作为检验、标定FBG应变监测结果的辅助工具.两种监测方法在具体应变量值上有一定的差异,原因可以归结为试验误差、传感器变形耦合程度以及照相质量好坏等几个方面.

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